Hi guys!!
I am trying to make a lead acid battery charger from this circuit diagram but the output voltage is 9.2V instead of 14.5V
I found out that this was because of negative resistance of BC548 which was around 9V
I want a charger with current limiting of 1.5A and which goes to 13.65V after full charge using lm317 and other part which are locally available.
Can anybody help me??
I am trying to make a lead acid battery charger from this circuit diagram but the output voltage is 9.2V instead of 14.5V

I found out that this was because of negative resistance of BC548 which was around 9V
I want a charger with current limiting of 1.5A and which goes to 13.65V after full charge using lm317 and other part which are locally available.
Can anybody help me??